Transcription of SECTION 5: OPTICAL AMPLIFIERS
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SECTION 5: OPTICAL AMPLIFIERS
SECTION 5: OPTICAL AMPLIFIERS . 1. OPTICAL AMPLIFIERS . In order to transmit signals over long distances (>100 km) it is necessary to compensate for attenuation losses within the fiber. Initially this was accomplished with an optoelectronic module consisting of an OPTICAL receiver, a regeneration and equalization system, and an OPTICAL transmitter to send the data. Although functional this arrangement is limited by the OPTICAL to electrical and electrical to OPTICAL conversions. Fiber Fiber OE OE. Rx Tx Electronic Amp OPTICAL Equalization Signal OPTICAL Regeneration Out Signal In Several types of OPTICAL AMPLIFIERS have since been demonstrated to replace the OE electronic regeneration systems. These systems eliminate the need for E-O and O-E conversions. This is one of the main reasons for the success of today's OPTICAL communications systems. 2. OPTICAL AMPLIFIERS . The general form of an OPTICAL amplifier : PUMP. power Amplified Fiber Weak Signal Fiber Signal OPTICAL AMP Medium OPTICAL Signal OPTICAL Out Signal In Some types of OAs that have been demonstrated include: Semiconductor OPTICAL AMPLIFIERS (SOAs).
fiber amplifiers (EDFAs) due to their ability to amplify signals at the low loss 1.55 m wavelength range. Characteristics of EDFAs (advantages): High power transfer efficiency from pump to signal power (> 50%). Wide spectral band amplification with relative flat gain (>20 dB) – useful for WDM applications. Saturation output > 1 mW (10 to 25 dBm).
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